I think the joke would have worked on Bitt if you'd said "Toaster Oven" instead of "Aga".

I did a Google search for "toaster oven" (though I guess, unlike Aga, it's exactly what it sounds like) and the first one I found has an LCD readout, memorises 7 brownness settings, costs $125 and generally looks considerably more complicated than my microwave. So whether or not it would've worked on Bitt, it didn't work on me

Peter